UWO Mathematics Calendar

Week of April 15, 2012
Wednesday, April 18

Ph.D. Presentation

Time: 13:00
Room: MC 107
Speaker: Tyson Davis (Western)
Title: Gerbes, twisted sheaves and essential dimension

 

Geometry and Combinatorics

Time: 14:30
Room: MC 108
Speaker: Bruce Fontaine (University of Toronto)
Title: Invariant spaces and the geometric Satake correspondence

Given a simple, simply connected Lie group G, a common object of study is the space of G invariant tensors in tensor product of G representations. In the case of a tensor product of minuscule representations, the graphical calculus of webs developed by Greg Kuperberg is a natural way to specify invariant tensors. On the other hand, the geometric Satake correspondence can be used to realize the invariant space as the top homology of a variety we call the Satake fibre. We will show that there is a connection between these the two different ways of constructing the invariant space.